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Ireland and Britain were both separated from the European continent at about this time (c. 12,000 BCE). The first people arrived in Ireland between 7,000-6,500 BCE at Coleraine in the far north. The Mount Sandel Mesolithic Site, discovered at Coleraine in 1973 CE, is the oldest archaeological site in Ireland.
The Giant's Causeway, renowned for its polygonal columns of layered basalt, is the only UNESCO World Heritage Site in Northern Ireland. Resulting from a volcanic eruption 60 million years ago, this is the focal point of a designated Area of Outstanding Natural Beauty and has attracted visitors for centuries.